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ŠUMARSKI LIST 5-6/2012 str. 51     <-- 51 -->        PDF

was slightly lower than the control in Halophila ovalis exposed to crude oil. The stability of the ratio Fv/Fm indi­cates preserved efficiency of photosystem II in clones ´Bo­ra´ and ´Pannonia´. Furthermore, these clones were cha­rac­te­rized by high photosynthetic activity.
Changes in the chlorophylls and carotenoids content in po­p­lars treated with crude oil were clone specific (Table 4.). Chlorophyll a, chlorophyll b and total chlorophylls were not considerably affected by treatments in clones ´Bora´ and ´Pan­nonia´ in most cases, while in clone ´9111/93´ values were con­­siderably decreased, what can be correlated with growth decrease. However, the total carotenoids content was not af­fected in poplars by treatments. Reduction in chlo­rophyll con­tent has been an indicator of environmental con­ta­mi­na­tion (Agrawal, 1992) indicating enhanced chlorophyll de­gradation. That may explain the lower levels of chlorophyll